Dry-sand Facing
Sand prepared exclusively for facing the surface of a dry-sand mould. Whilst there are, no doubt, many good mixtures for this purpose, the following will always be found reliable and trustworthy, as it works well in finishing, requires little or no venting, may be rammed very hard, and will not be seriously affected, so far as the mould is concerned, if it should not be thoroughly dry. Silicious or fire sand 8, moulding-sand 2, flour 1. Let the above ingredients be prepared medium dry, and mix for using with clay-water. The sands mentioned should be equivalent to the Jersey grades. See FACING-SAND; FACING.